PNP
ATOM  C1   C2   C3   C4   C5   C6   CM   N    O1N  O2N
ATOM  P    O1P  O2P  O3P
CONNECT -  C1   C2  C3  C4  C5  C6  C1  O1P  P  CM +
CONNECT  C4   N  O1N
CONNECT  N    O2N
CONNECT  P    O2P
CONNECT  P    O3P